My S200 has the datalogging option. There are 2 serial cables available in the DB9M to DB9F configuration. One is simply listed as a "serial" cable for connecting printers, etc. The other is called a "null modem cable", used to transfer data from one computer to another computer. My understanding is they are wired differently. Which one is needed for S200 datalogging? I will be using the Keyspan USB adapter into my Win7 laptop. Thanks, satwilson

Windows 7 does not support serial cables nor parallel, I even doubt that the keyspan usb convertor will work.
Install windows xp on an old machine with a serial connection.
None of recent laptop have the connector anymore.